CHAPTER X. 



LANTERN-SLIDE MAKING A SLIDE-MAKING FRAME. 



Lantern slides, if well made, give pleasure to 

 young and old, whilst their educational value is 

 universally acknowledged to be of great importance. 

 They no longer remain the monopoly of the travel- 

 ling entertainer, since slides are now produced by 

 almost every scientific society. Equally helpful 

 are they in the private house where one who has 

 learnt how to make them may enjoy many a winter 

 evening, even with only himself for audience. To 

 one who has mastered the art of negative making 

 no difficulty will be experienced, for the developing 

 of lantern slides is similar, except that a positive 

 image appears, instead of a negative. This fact 

 renders it much fuller of interest, as the gradual 

 unfolding of the complete image never fails to de- 

 light the operator. The standard size for English 

 slides is 3%^ in. by 3^in., a suitable size for contact 

 printing from a 4^ in. by 3^ in. negative. 



The usual slide-making frame consists of a board 

 having a 3% in. square hole in the centre, into which 

 the sensitised plate fits. The negative is placed 

 film side to this hole, and is held against the cloth- 

 faced board by springs in such a way that the nega- 

 tive may be moved in any direction to bring the 



